Tilting-chair.



No. 696,667. Patented Apr. 1,1902.

V J, ELLENBECKER.

TILTING CHAIR.

(Application fil d Jun 20, 19014) (No Medal.)

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UNETED States Patent t niest JOHN ELLENBEGKER, OF PORT XVASHINGTON,YVISCONSIN.

TlLTlNG-CHAIR.

SPECIFICATION formingpart of Letters Patent No. 69 6,667, dated April 1,1902.

Application filed ne 20,1901- Serial No. 65,225. (No model.

To rtZZ whom it may concern:

Beit known that I, John ELLENBEOKER, residing at Port \Vashington, inthe county of Ozaukee and State of W isconsin, haveinvented a new anduseful Improvement in Tilting- Chairs, of which the following is adescription, reference being had to the accompany ing drawings, whichare a part of this specification.

The object of my invention is to provide improved means for supportingthe seat of a chair tiltably, the improved device being especiallyadapted for use in a chair in which the seat is also revolublehorizontally and is adjustable vertically by means in common use.

The invention consists of the device, its parts and combinations ofparts, as herein described and claimed, or the equivalents thereof.

In the drawings, Figure 1 is a longitudinal section from front to rearof my improved device. Fig. 2 is a top plan view of the device, partsbeing broken away for showing otherwise-hidden parts. Fig. 3 is a frontview of the head of the spindle with related parts, the spider beingshown in transverse section. Fig. t is a rear view of a rockingcross-bar. Fig. 5 is a fragment, partly in section, of a modified formof the device.

In the drawings, A is a spider or frame on which the chair-seat restsand to which it is secured conveniently by screws or equivalent means.This spider in a general way is of a common form, consisting of theforwardly and rearwardly extending side rails 2 2, a front cross-bar 3,and a medially-located cross-bar 4:. Also there are integral downwardly-projecting ears 5 5, one on each rail 2, medially thereof. Thespider is advisably of malleable iron, and other parts may also be ofmalleable iron, except the springs, which are of steel.

The spider A is pivoted on its support by means of a pin 6, so as to becapable of tilting rearwardly from its normal position. As tiltingdevices are usually employed in connection with .a revolving chair, Ihave shown a fragment of a spindle 7, such as is employed for supportingthe chair-seat vertically and revolubly on the ordinary base. Thisspindle is provided with a rigid head 8,

having two upwardly-extending arms 9 9. The pivot-pin 6 passestransversely through the lower ends of the ears 5 5 and through the head8 at the lower extremities of the arms 9 9, which arms project upwardlyfrom the pivot-pin radially and are expanded in the form of segments ofa disk. The top edges of the radial arms 5) 9 are recessed centrally,providing radial fingers 1O 10, two on each arm, one at the front andthe other at the rear, which are adapted to engage an interposed stop11, integral with the spider and projecting into the path of the fingers10 10. These fingers on the radial arms 9 9 are so disposed that thestops 11 bear against the front fingers 10 10 in the manner shown inFig. 1 and prevent the front of the spider from tilting downwardlybeyond a substantially horizontal position. The fingers 10 10 at therear are so disposed as to permit the spider to be tilted upwardly atthe front and correspondingly rearwardly to a predetermined position.

For holding the spider in the substantially horizontal position shown inFig. 1 yieldingly and for returning it to this position when it has beentilted rearwardly one or more springs 12 12 are provided. Preferably twocoiled steel springs are employed. These springs at their front endsbear against a transverselydisposed rocking plate 13, provided at itsextremities with trunnions that rest in sockets 14 14. therefor, thesockets being formed in the inner sides of the rails 2 2 of the spider alittle at the rear of the ears 5 5 or at the rear of the vertical planeof the pivot-pin 6. The sockets 14: are in the form ofverticallydisposed recesses open upwardly, so that the trunnions on theplate 13 may be placed in the sockets from above when the plate is inother than a substantially vertical position. When the trunnions havebeen thus intro duced into the socket, the plate is brought to avertical position and lugs. 15 15 thereon come immediately below stops16 16 on the rails of the spider and prevent the removal of the platefrom the sockets while in such vertical position in which it is held byrelated parts, as hereinafter described. At the rear extremities of thesprings 12 a transverse plate 17 bears against the springs, whichsprings are held in position on the plates 13 and 17 by bosses 18 intruncated-cone form thereon. A tie-rod 19, provided with a head thatbears against the outer surface of the plate 17, passes through theplate 17 and through the plate 13 and through a rocking yoke 20 and isprovided with a nut 21, turning on a screw-thread on the rod 19, againstthe front surface of the yoke 20. The nut 21 is advisably provided witha small handwheel for conveniently rotating it. The rod 19 is preferablyfaced or squared near its head and tits in a corresponding aperture inthe plate 17, whereby the rotation of the rod 19 is prevented. The yoke20 includes angled or cranked arms 22 22, the front extremities ofwhichare in the form of trunnions, having their bearings intrunnion-bearing members 23 23, formed integrally on the radial arms 9and extending inwardly toward each other and slightly forwardlytherefrom. This construction locates the yoke 20 near to andadvisablyslightly in front of the vertical plane of the pivot-pin 6, andat the same time the body of the yoke against which the nut 21 bears isat the rear of the trnnnions of the yoke, thus providing for a swing ofthe yoke at the rear of its axis and at that side thereof in thedirection of the pull on the rod 19. The nut2l, wit-h its hand-wheel forready adjustment of the nut for regulating the tension of the springs,is also located at the front of the pivot of the spider and is thereforeconvenient of access, while not being so near the front of the chairasto be in the way of the user of the chair or otherwise objectionable.

In the modified form of construction shown in Fig. 5 a transverse plate24, rigid on the spider and advisably integral therewith, is employedinstead of the rocking plate 13 of the other form of construction.Otherwise the two devices are substantially alike. In this modified formof construction the rod 19 passes through the plate 24 in a slottherefor that is somewhat elongated vertically to provide for a slightshifting of position of the rod with reference to the plate.

What I claim as my invention is- 1. In a tilting-chair, a support havingupwardly-projecting expanding radial arms provided with terminal fingersand an intermediate space, a chair-seat spider pivoted on the supporttiltable backwardly, stops fixed on the spider projecting into the spacebetween said fingers and adapted to engage said fingers toward front andrear and limit the tilting movement of the spider and springs secured tothe spider and to the support adapted to hold the spider yieldinglyagainst the front fingers and permit it to tilt to and against the rearfingers on said arms.

2. In a tilting-chair, a support having upwardly-projecting radial arms,ahorizontallydisposed chair-seat spider provided with medialdownwardly-projecting ears pivoted near their lower extremities on thearms of the support, springs at the rear of the vertical plane of theaxis of the pivot, a plate on the spider at the rear of the verticalplane of the pivot against which the front ends of the springs bear, aplate against the rear ends of the springs, a rod secured to the rearspring-plate and passing movably through the front springplate, a yoketrunnioned on the arms of the support, and a nut turning by screw-threadon said rod and bearing on the yoke at the rear of the axis of thetrunnions.

3. In a tilting-chair, a support having upwardly-projecting radial arms,a horizontallydisposed chair-seat spider provided with medialdownwardly-projecting ears pivoted near their lower extremities on thesupport,springs at the rear of the vertical plane of the axis of thepivot, a plate on the spider at the rear of the vertical plane of thepivot against which the front ends of the springs bear, a plate againstthe rear ends of the springs, a rod secured to the rear spring-plate andpassing movably through the front spring-plate, a yoke through whichsaid rod passes movably, said yoke having forwardly-extending crankedarms provided with trunnions, trunnion-bearing members extendinginwardly from the upper ends of said arms of the sup port, and a nutturning by screw-thread on said rod against the yoke at the rear of itstrunnions.

4. In a tilting-chair device, a spider provided with trunnion-socketsextending vertically and open upwardly in its side rails, and stops onthe spider near the sockets and a spring-plate provided with trunnionsadapted to enter and bear in said sockets, and lugs on said plateadapted when the plate is in place having its width in vertical positionto engage the stops on the spider and prevent the removal of the platefrom the spider While in such normal vertical position.

5. In a tilting-chair, a support having upwardly-projecting armsprovided at the front near their upper ends with inwardly-projectingtrunnion-bearing members having bearings for trunnions', a yoke providedwith forwardly-projecting cranked arms having trunnion-terminalsrevoluble in said trunnionbearings, a spider pivoted on said support,springs mounted on the spider at the rear of its pivot,'aspring-controlling rod extending movably through said yoke, and a nutturning on said rod and bearing against said yoke at the rear of theaxis of its trunnions.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN ELLENBECKER.

Vitnesses:

WILLIAM AHLHAUSER, ANDREW J. FLIER.

